Raymond d



R. D. JOHNSON.

VALVE.

APPLICATION. FILED JUNE 16. 19:6.

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VALVE.

Specification of Letters Patent.

Patented Nov. 11, 1919.

vApplication led June 16, 1916. Serial No. 104,061. f

To all whom t may concern:

Be it known that I, RAYMOND D. JOHN- soN, a citizen of the United States, residing at New .York, in the county of New York and State of New York, have invented certain new and useful Improvements in Valves, of whichl the following is a specifi-` cation.l

My invention relates to certain improvements in valves of the t` pe shown in my previous Patent No. 1,030,890, patented July 2, 1912, the valve herein shown being of the same general construction.

These improvements relate to means for providing an `automatic closure of the valve when fthe velocity of flow attains any prescribed magnitude; to means forinsurin a more near perfect guidance 'of the mova le valve member; vand to means for indicating on the Outside of the casing, the position of the valve within the casing, the indicating means being arranged to, if desired, autoniatically operate the control valve.

'lhe manner in which I provide for. these and other improvements will fully appear in the accompanying specication and drawings, in which- Figure 1 is a longitudinal section of one form of valve, with pipe connections shown diagrammatically F ig. 2 is a transverse sectlon on plane a-Q of rig. 1.

lFig. 3 is a detail showing the means for connecting the indicator to the control valve for Operating the saine.

Referring to the drawings, 1 represents a fluid conduit, which will for illustration be assumed to serve for conveying Wa-ter under pressure. 3 is an enlargement ofI the conduit constituting the valve chamber and having a gradually expanding portion 2.

Mounted within this chamber, and spaced from the walls thereof, is a cylindrical chamber 4 havin a closed conical. nose 5. rl`he cylinder 4 1s rigidly held in central position by a series of radial ribs 6. Slidy ing -within the cylinder 4 is a plunger 7, also' having a conical nose 8, both the noses hav# ing such a conguration as to subdivide the fluid smoothly as it enters and leaves the valve. rlhe nose 8 is provided with a closure surface properly shaped to coperate with a corresponding valve seat 31. The cylinder 4 and plunger 7 are, as shown in Fig. 1,' so shaped as to form an annular chamber lA within the operating cylinder 4, in addition to the central chamber B.

By means of a suitable external control valvl andhpiping, either pipeline. pressure or a mo eric ress'ure ma e a lied in the chaisdbers p y Pp' line pressure to A, and exhausting it from B, opens the valve; reversing the operation closes the valve'.

These. operations may be effected by a control valve which may be of any suitable A and B. Admitting pipetype,`-as shown in Fig.' 1, it is of the piston -type and consists of a cylinder 10 having therein a lpiston valve provided with a chamber C, for alternately connecting the pipes 13 and 14 to the exhaust 15. Pressure f luid is admitted to' opposite sides of the p1ston valve by pipe 12 connected to a region of high pressure in the main iuid conduit 1. ipes 13 and 14 lead respectively to chambers A and B.V

.The piston rod 16 of the control valve plston 1s plvoted to a lever 17, having one.

-thef nose 8 of the plunger 7, and extends through the wall of the casing 3. The

pointeron the endof the rod and a scale 29v enable the location of the plunger to be determined. As shown in Fig. 3, this indicator rod 28'may, however, be connected to the control valve by means of a floating lever 30 and link 20 As shown in Fig. 2, the indicator rod 2'8 is located within a forkshaped cavity in the inner edge of the rib 6,`and `is thus protected against injury or displacement by the flow of water, or substances carried by such flow, through the passage near theend of the valve.

Another feature of improvement is the extension of ribs 6, beyond the end of the cylinder 4 to the Wall of the casing 3, the

port for the plunger; al he way to its'seat 1 on the inner wall Of the casing 3.

Still another featurev of v improvement. is

the provision of means for causing the valve to automatically close in case of excessive velocity of How in the main conduit, as- When a break in the pipe line occurs beyond the valve.

As shown in Fig. 1, the chamber A, is connected by pipes 32, 33 and 34 with a re-4 gion of lower pressure, the ra-te of flow.

. 'pressure regions in theconduit 1, 2. A pipe 36 connects the pipe 39 with the interior of chamber B.

The operation of the valve is as follows As shovvn in Fig. 1, the valve, of the horizontal type, isin the full open position with the piston valve 11 of the control-valve, closing the ports from the pipes 13 and 14 into the cylinder 10.- If 'now it is desired to close or partially close the valve, the operating lever 19 is moved to the right thereby connecting the pipe 13 through the chamber C With the exhaust 15 and admitting pressure Water through pipe 12 into the cylin-` der 10 and thence into pipe 14. ,Pressure Water is thus admitted to chamber B, and chamber A is allowedto exhaust. The pressure upon the left-hand end of the plunger 7 causes the valve to' begin its closing movement. As soon as the valve has reached its desired position, as indicated by the pointer on the end of rod 28, the operating lever 19 is moved to restore the piston valve 11 to its neutral position, thereby cutting od bothl the supply of pressure Water to chamber B and stopping the exhaust from chamber A.

In case it is desired to provide for auto" matic closure of the valve upon the occurrence of an excessive flow of Water in the conduit, the chamber B is put into communication with a region of high pressure by openingvone or the other of the valves 38 or 40. The'valve 35 is also opened to connect the chamber A with a region of loW pressure. Assuming that .the chamber -B is connected to the high 4pressure region through pipe 37, the valve 38 and the valve 35 are each so adjusted that under normal conditions, with the lvalve open, the flow through pipe 36 and pipe 32 will be so small as not to eii'ect any change of position in the plunger 7. I twill be understood that in the position of the valve as shown in Fig. 1, both chambers A and B are full of Water land that there is a constant slight leakage` from chamber B to chamber A, since the sliding surfaces of theplun'ger 7 and piston 4 are not packed. Under normal How conditions, therefore, the iioW of Water past the pipe system about the point 51.

in 'the pipe line beyond the valve, an abnormal diminution of pressure occurs in the region to which pipe 34 is connected and the chamber A is gradually ldrained ot Water, while at the same time pressure Water continues to be supplied to chamber B through the pipe 36. The valve therefor gradually and automatically closes, thereby shutting oil' the Water in the conduit bevond the v alve. As these valves are adapted for and actually used in conduits of -large diameter, as large as twelve feet, the iinportance of this feature'of automatic closing lof the valve Will be readily understood, the'fiow of Water in case of a break. being of such volume as to cause great damage unless'I promptly shut oil'.

As shown in Fig. 3 the control valve is directly connected to the indicator rod 28.

of opening indefinitely since the motion of `the plunger tends` to operate the control valve in a direction contrary to the attempted motion of the plunger. Thus, ii the operating valve be moved to the right, the sysem of' levers will operate about Ythe temporarily fixed point 50, thereb)Y causing the admission of pressure water into chamber B andthe exhaust of Water from the chamber A, and the plunger 7 will move to the right carrying with it the pivotal point 50, and in turn operating thc lever l This movement vvill cause the piston valve 11 to be moved in the reverse direction until it has assumed its neutral position, whereupon both the pressure supply and the exhaust will be cut olf and the plunger 7 will remain stationary at the point corresponding to the positioh ofthe operating lever 19. It will be obvious that oncethe lever 19 has been set to anv given position, anymovement of the valve,

-Will at once be counteracted by a movement of the control valve in suoli direction as to restore the main valve to its original position.

I claim 1. In combination, a fluid conduit havin@ a contracted portion constituting a refrioii of relatively low fluid pressure, a valvebseat adjacent said contracted portion, a valve structure comprising a fixed cylinder supported within and spaced from the Walls of said conduit, a plunger sliding Within said cylinder, the cylinder and plunger being shaped to form a closed pressurechamber therebetween, means for operating the valve structure at will and means for automatically closing the valve when the rate auA lill

of How in the conduit exceeds a definite limit, said means comprising a Huid connection between 'the cylinder and a point of relatively high pressure and a fluid connection between the said pressure chamber and a point of relatively low pressure. v

2. lin combination, a fluid conduit having a contracted portion constituting a region of relatively low Ifluid pressure, a valve seat adjacent said contracted portion, a valve structure comprising a fixed cylinder supported within and spaced from the walls of said conduit, a plunger sliding within said cylinder, the cylinder and plunger being shaped to form a closed pressure chamber therebetween, means for operating the valve structure at will andy means for automatically fclosing the valve when the rate of low in the conduit exceeds a deiinitelimit, said means comprising a fluid connection between the cylinder and a point of relatively highl pressure, means for adjusting the fluid conducting capacity of said connection, a fluid connection between' said pressure chamber and a point of relatively low pressure and means for adjusting the fluid conducting capacity of said last-mentioned connection.

3. In combination, a fluid conduit having a contracted portion constituting a region of relatively low fluid pressure, a valve seat adjacent said contracted portion, a valve structure comprising a lixed cylinder supported within' and spaced from'said casing, a plunger sliding within said cylinder, the cylinder and plunger being shaped to form a closed pressure chamber therebetween,

means for admitting pressure fluid to andy lfluid connection between the cylinder an a point of relatively high pressure, a luid connection betweenthe sai pressure chamber and a point of relatively low pressure, means for independently adjusting the fluid conducting capacity of said connections, and means for admitting pressure lluid to and exhausting it from said pressure chamber and said cylinder.

5.Y In combination, a liuid conduit having a contracted portion constituting a re gion of relatively low fluid pressure, a valve seat adjacent said contracted portion, a valve structure comprising a fixed cylinder supported within and spaced from the walls of said conduit, a plunger sliding within said cylinder, the cylinder and plunger. being shaped to form a closed pressure chamber therebetween, means for admitting pres- 'sure fluid to and exhausting it from said `lhaving a valve seat on its inner Wall, a

iixed cylinder supported within and spaced from the wall of said casing by ribs extending from the wall of the casing and the ,wall of the cylinder, a plunger sliding within said cylinder and having a closure ysurface cop'eratingwith said valve seat, one of said ribs having. a forked end portion,

and an indicator'roddirectly connected to said ,plunger and extending between the forks of 'said rib and through the wall of the casing.

7. In combination, a Huid conduit having a contracted portion constituting a regionv of -relatively low fluid pressure, a valve seat adjacent' said contracted portion, a valve structure comprising a i-xed cylinder supported within and spaced from the walls of said ronduit, a plunger-sliding within said cylinder, the cylinder .and plunger bemg 'shaped to form -a central chamber and an annular chamber therebetween, but so as to .define a constricted passage wayfor the rluid t0 pass through the annular chamber into the central chamber, a `fluid connection between the central chamber and a point of relatively high pressure in the conduit, and a fluid connection between said annular chamber and a point of relatively low pressure.

8. In combination, a fluid conduit having a contracted portion constituting a region of relatively low-fluid pressure, a valve seat adjacent said contracted portion, a valve structure comprising a fixed cylinder supported within and spaced from the walls of said conduit, a plunger sliding` within said cylinder, the cylinder and plunger being shaped to form a central chamber and an annular chamber therebetween, but soy that a leakage can taire place through the annular chamber into said central chamber,

aruid connection between the central chamber and a point of relatively high pressure in the conduit, and a fluid connection between said annular chamber and a point of relativelylow pressure.

9. In a valve of the type recited having a region of relatively low pressure and-in combination therewith elements having central and annular chambers, said elements comprising a movable plunger, connections by which the pressure in said chambers is normally equalized when the movable plunger elementis retracted, and a connection from the annular chamber to the region of relatively' low preure to automatically close the valve in response to further drop in pressure at said region such as is induced by abnormal increase in low,'substantially as described.

In testimony whereof I alx my signature.

RAYMOND D. JOHNSON. 

